package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;


@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws Exception {
        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()){
            //目录不存在,创建
            dir.mkdirs();
        }
        //原始文件名
        String originalFilename=file.getOriginalFilename();
        //原始文件名后缀
        String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
        String fileName= UUID.randomUUID().toString()+suffix;
        //将文件持久化到指定目录
        file.transferTo(new File(basePath+fileName));
        return R.success(fileName);
    }

    /**
     * 文件下载
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws Exception {
        //输入流,获取文件
        FileInputStream is=new FileInputStream(basePath+name);
        //输出流,response输出流
        ServletOutputStream os = response.getOutputStream();
        //拷贝
        IOUtils.copy(is,os);

        is.close();
    }

}
